diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..22d0d82
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+vendor
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index c2195a7..cbc7f4b 100644
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -259,12 +259,12 @@ final class BackendController extends Controller
         $view->setTemplate('/Modules/Accounting/Theme/Backend/costcenter-list');
         $view->addData('nav', $this->app->moduleManager->get('Navigation')->createNavigationMid(1002602001, $request, $response));
 
-        if ($request->getData('ptype') === '-') {
+        if ($request->getData('ptype') === 'p') {
             $view->setData('costcenter',
                 CostCenterMapper::withConditional('language', $response->getHeader()->getL11n()->getLanguage())
                     ::getBeforePivot((int) ($request->getData('id') ?? 0), null, 25)
             );
-        } elseif ($request->getData('ptype') === '+') {
+        } elseif ($request->getData('ptype') === 'n') {
             $view->setData('costcenter',
                 CostCenterMapper::withConditional('language', $response->getHeader()->getL11n()->getLanguage())
                     ::getAfterPivot((int) ($request->getData('id') ?? 0), null, 25)
@@ -297,12 +297,12 @@ final class BackendController extends Controller
         $view->setTemplate('/Modules/Accounting/Theme/Backend/costobject-list');
         $view->addData('nav', $this->app->moduleManager->get('Navigation')->createNavigationMid(1002603001, $request, $response));
 
-        if ($request->getData('ptype') === '-') {
+        if ($request->getData('ptype') === 'p') {
             $view->setData('costobject',
                 CostObjectMapper::withConditional('language', $response->getHeader()->getL11n()->getLanguage())
                     ::getBeforePivot((int) ($request->getData('id') ?? 0), null, 25)
             );
-        } elseif ($request->getData('ptype') === '+') {
+        } elseif ($request->getData('ptype') === 'n') {
             $view->setData('costobject',
                 CostObjectMapper::withConditional('language', $response->getHeader()->getL11n()->getLanguage())
                     ::getAfterPivot((int) ($request->getData('id') ?? 0), null, 25)
diff --git a/Theme/Backend/costcenter-list.tpl.php b/Theme/Backend/costcenter-list.tpl.php
index 82cf54c..fd6c8cd 100644
--- a/Theme/Backend/costcenter-list.tpl.php
+++ b/Theme/Backend/costcenter-list.tpl.php
@@ -20,8 +20,8 @@ use phpOMS\Uri\UriFactory;
  */
 $costcenter = $this->getData('costcenter');
 
-$previous = empty($costcenter) ? '{/prefix}tag/list' : '{/prefix}tag/list?{?}&id=' . \reset($costcenter)->getId() . '&ptype=-';
-$next     = empty($costcenter) ? '{/prefix}tag/list' : '{/prefix}tag/list?{?}&id=' . \end($costcenter)->getId() . '&ptype=+';
+$previous = empty($costcenter) ? '{/prefix}tag/list' : '{/prefix}tag/list?{?}&id=' . \reset($costcenter)->getId() . '&ptype=p';
+$next     = empty($costcenter) ? '{/prefix}tag/list' : '{/prefix}tag/list?{?}&id=' . \end($costcenter)->getId() . '&ptype=n';
 
 echo $this->getData('nav')->render(); ?>
 <div class="row">
diff --git a/Theme/Backend/costobject-list.tpl.php b/Theme/Backend/costobject-list.tpl.php
index a227552..321a865 100644
--- a/Theme/Backend/costobject-list.tpl.php
+++ b/Theme/Backend/costobject-list.tpl.php
@@ -20,8 +20,8 @@ use phpOMS\Uri\UriFactory;
  */
 $costobject = $this->getData('costobject');
 
-$previous = empty($costobject) ? '{/prefix}tag/list' : '{/prefix}tag/list?{?}&id=' . \reset($costobject)->getId() . '&ptype=-';
-$next     = empty($costobject) ? '{/prefix}tag/list' : '{/prefix}tag/list?{?}&id=' . \end($costobject)->getId() . '&ptype=+';
+$previous = empty($costobject) ? '{/prefix}tag/list' : '{/prefix}tag/list?{?}&id=' . \reset($costobject)->getId() . '&ptype=p';
+$next     = empty($costobject) ? '{/prefix}tag/list' : '{/prefix}tag/list?{?}&id=' . \end($costobject)->getId() . '&ptype=n';
 
 echo $this->getData('nav')->render(); ?>
 <div class="row">